Troubleshooting guide

Trunking
117
Embedded PRI
Embedded PRI calls
fail and all Status
LEDs on the Dual
T1/E1 Framer are
OFF.
Configuration. Verify that embedded PRI is programmed
properly in the following forms (see also Program
Embedded PRI/Q.SIG in the Online Help):
• Controller Module Configuration
• Dual T1/E1 Framer Configuration
• Link Descriptor Assignment
• Digital Link Assignment
After the Digital Links form is completed, the
T1/E1 Framer status LEDs should come on. This
takes about 15 seconds.
Embedded PRI Links
are “not seizable”,
Status LEDs show
RED alarm.
Configuration or wiring. Ensure that the ISDN cable is plugged into the
correct RJ-45 port on the Dual T1/E1 MMC. Verify
that the ISDN cable is correctly wired.
Change the “Termination Mode” setting in the
Digital Link Descriptors form - either LT or NT.
This change takes about 30 seconds to take
effect.
Embedded PRI links
are “not seizable”,
Status LEDs show
flashing GREEN.
Configuration. Verify the “Network Side/QSIG Master” setting in
the ISDN Protocol form. Check the “Inverted
D-Channel” setting in the Digital Link Descriptors
form - normally it is set to “No”. Each of these
changes takes approximately 30 seconds.
Embedded DPNSS
links are “not
seizable”, Green LED
is ON
Configuration. Ensure that the “Address for Message Control”
field in the Digital Link Descriptors form is set
appropriately (“A” or “B” depending on the far end.
If the configuration is correct, wait for about one
minute until every circuit has finished negotiation
with the far end.
Distorted voice or loud
noise over PRI/QSIG
call
Voice Encoding is not set properly. In the Link Descriptor Assignment for the
PRI/QSIG trunk, set the “Voice Encoding” to Nil
for T1 on NA or E1 on Euro controller.
Note: You cannot use the same Voice Encoding
settings as a PRI NSU.
High number of slips. Configuration of Network
Synchronization form.
Ensure that the synchronization source being
selected is to a digital PSTN trunk (like PRI or
T1/D4).
Outgoing calls fail with
reorder tone.
Configuration error in ARS
programming or ISDN Protocol
form.
Enter the CCS TRACE maintenance command to
ensure that the proper digits are being sent out.
Check the Digit Modification with the Per-Call
programming for PRI to make sure digits are not
being inserted or absorbed unnecessarily.
Ensure that the “Protocol” field in the ISDN
Protocol form is correct for the PSTN link (not for
DPNSS).
Table 34: Digital Trunk Troubleshooting
Symptom Probable Cause Corrective Action
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